70% biscuits.
20% liquid helium and 10% conferences.
(
Colonel Boris "...a desperate Buzzfeed imitation...",
Mon 8 Aug 2011, 16:37,
archived)
If the biscuits are 29% helium, you can both be right. :)
Mmmmm... Helium Biscuits!
(
Good Penny,
Mon 8 Aug 2011, 16:46,
archived)